a(n) = Sum_{k=0..n} (2*k+1) * binomial(2*k,k) * binomial(2*n-k,n-k).
A386942
a(n) = Sum_{k=0..n} (2*k+1) * binomial(2*k,k) * binomial(2*n-k,n-k).
Terms
- a(0) =1a(1) =8a(2) =54a(3) =340a(4) =2060a(5) =12180a(6) =70812a(7) =406656a(8) =2313630a(9) =13067340a(10) =73372728a(11) =410013864a(12) =2282066332a(13) =12658839200a(14) =70017730680a(15) =386314361808
External references
- oeis: A386942